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"Feeling oddly as though his legs had turned to lead, Harry got into line behind a boy with sandy hair, with Ron behind him, and they walked out of the chamber, back across the hall, and through a pair of double doors into the Great Hall."

Lead (chemical symbol Pb) is a chemical element; a soft, malleable heavy metal. Lead has a bluish-white colour after being freshly cut, but it soon tarnishes to a dull grayish colour when exposed to air.[1]

The earliest Bludgers were made of lead. It was discovered, however, that lead was too soft a metal to make a good Bludger, as it was easily dented by Beater's bats, affecting the Bludger's ability to fly straight. As such, future Bludgers were made of iron.[8]